STRYKER CORP | 2013 | FY | 3


GOODWILL AND OTHER INTANGIBLE ASSETS
We completed our annual impairment tests of goodwill in 2013 and 2012 and concluded in each year that no impairments exist. The changes in the net carrying value of goodwill by segment are as follows:
 
 
Reconstructive
 
MedSurg
 
Neurotechnology and Spine
 
Total
Balance as of January 1, 2012
 
$
685

 
$
510

 
$
877

 
$
2,072

Goodwill acquired
 
8

 

 
67

 
75

Foreign currency translation effects and other
 
(2
)
 
3

 
(6
)
 
(5
)
Balance as of December 31, 2012
 
691

 
513

 
938

 
2,142

Goodwill acquired
 
1,559

 
2

 
108

 
1,669

Transfers
 
(17
)
 
(9
)
 
26

 

Foreign currency translation effects and other
 
(6
)
 

 
39

 
33

Balance as of December 31, 2013
 
$
2,227

 
$
506

 
$
1,111

 
$
3,844


Measurement period adjustments that reflect changes to goodwill for acquisitions completed in a previous year are included in "Foreign currency translation effects and other."
The following is a summary of our other intangible assets: 
 
 
Gross
Carrying
Amount
 
Less
Accumulated
Amortization
 
Net
Carrying
Amount
 
 
2013
2012
 
2013
2012
 
2013
2012
Intangible assets:
 
 
 
 
 
 
 
 
 
Developed technologies
 
$
1,450

1,069

 
$
380

282

 
$
1,070

787

Customer relationships
 
677

563

 
189

147

 
488

416

Patents
 
238

230

 
190

182

 
48

48

Trademarks
 
127

69

 
34

31

 
93

38

In-process research and development
 
223

86

 


 
223

86

Other
 
118

105

 
51

56

 
67

49

 
 
$
2,833

$
2,122

 
$
844

$
698

 
$
1,989

$
1,424


The estimated amortization expense for each of the next five years is as follows: 
 
2014
2015
2016
2017
2018
Estimated amortization expense
$
167

$
163

$
162

$
158

$
156


us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock